Yellow vat dye.



yields a red an mus nttrrnm nnns nun ERNST scnwnnz, or mnnnnnm; GERMANY,assiduons *ro nanrscnn amnm & sona FABRJK, or LUDWIGSHAFEN-ON-THE-RHINE,GERMANY, a conronnrron or GERMANY. 7

YELLOW Vdll DYE.

noa'aete.

No Drawing.

I GO

We can prepare our new coloring matter by first treatingl-chlor-anthraquinone-Q- carboxylic acid with 2.4.5-trichlorl-thiophenol and then treating the product with a condensing a ent such,for instance, as con; centrated sulFuric acid, until a thioxanthone ringis formed. Our new coloring matter consists, when dry, of a yellowpowder and, in the pure state, has a percentage compositioncorresponding to the above formula.

It yields a blue-red solution in concentrated sulfuric acid, a violetvat in alkaline hydrosulfite solution, and dyes cotton from this vatyellow shades of excellent fastness against the action of chlorin andlight.

In this invention, bromi 1- is equivalent to' chlorin.

The following example will serve to illustrate further the nature of ourinvention, which, however, is not confined to this example. The partsare by weight. Boil together, for about 12 hours, in a reflux apparatus,120 parts of l-chlor-anthraquinone-2- carboxylic acid, 90 parts of2.4.5-trichlor-lthiophenol, 20 parts of caustic soda, 25 parts ofcaustic potash and 300 arts of water.

Then filter and acidify the ltrate with dilute acetic acid, filter ofi"the trichlorbenzene-thio-l-anthraquinone-Q-carboxylic acid and washandvdry it. The acid thus obtained is a eenish yellow dish yellowsolution in caustic alkali and in alkali carbonate, and a dullSpecification of Letters Patent. I

Application filed November 3, 1911. Serial No. 658,4:24.

powder which Patented Nov, 19, EH2.

reddish brown solution in cold concentrated sulfuric acid. Heattogether, on the waterbath, 10 parts of the product thus obtained and100 parts of concentrated sulfuric acid, whereupon the color of thesolution changes from dull red-brown to brilliant blue-red. When a testportion, on being diluted with water, is practically insoluble in excessof caustic soda solution, pour the reaction mixture into Water, filteroil the coloring matter and wash it with water and with boiling dilutesodium carbonate solution. it consists of a yellow powder which yields aviolet vat and dyes cotton yellow shades oi excellent fastness againstthe action of chlorin, light and washing. The2.4.5-trichlorbenzene-thiophenol employed. in this example can beobtained by treating 1.2.4-trichlorbenzene with chlor-sulfonic acid andreducing the product with zinc dust.

Now what we claim is l. The vat coloring matter which possesses aconstitution corresponding to the formula Hal Hal 8 I l c o un IUOformula which coloring matter consists, when dry,

"I f Q 1,044,675

50f yellow powder which a; bhie red set our hands in the presence of twosubeolutlon in concentrated sulfuric acid,a vio scribing witnesses.

' let vat in alkaline hydrosulfite solution, and ARTHUR LfiTTRINGHAUgvwl iich dyes cotton from this vat yellow ERNST'SCHWARZ'Q sfshades ofexcellent fastness against the ac- Wit tion of chlorin and light. J,Ame. LLOYD,

In'testimony whereof we have"here'unto 'J P

